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The Ray Mk III is a Robo in the 'Ray' series that hails from the Custom Robo series. It is a well balanced 'Power Model' from the Shining Fighter line. It first appears in Custom Robo Arena for the Nintendo DS. In Custom Robo Arena, the main character switched his Ray Mk II, which was the main Robo used by the protagonist in Custom Robo V2, to a new model made by his sister and father.

In Brawl, this small yet hardy fighter leaps upward before firing a volley of lasers from its hand-held blaster or occasionally an explosive charge with its bomb launcher and hovers in place while firing before dashing horizontally around the arena a few times per jump, akin to the series. It is an unlockableAssist Trophy and becomes available after playing 100 brawls.

The custom robo used by the main character. It's the latest Shining Fighter model in the Ray line of robots, which appears throughout the Custom Robo series. The main character switches from his beloved Ray Mk II to this model after his sister and father develop it. This one has a great balance between built-in abilities and ease and depth of available customization.

Ray Mk III does not reprise its role as an Assist Trophy. Instead, it appears as a costume for Mii Gunner. Ray Mk III also appears as a Primary Spirit in Ultimate after being enhanced from Ray Mk II Spirit. It is an Ace three star Spirit with three open slots and the Lightweight characteristic.

It is very likely, due to trophy description and design of trophy, that this is the exact same model from the Nintendo DS game Custom Robo Arena, as the player is referred to as the "main" character, and has a father and sister, who created the Mk series.

While in most official artwork the Ray Mk III is shown equipped with the Straight Bomb G, the yellow part on its left arm, in Brawl it instead is shown with the Straight Bomb T, the red model.

Although the Assist Trophy is shown equipped with the Flare Gun, Straight Bomb T, Twin Flank Pod G and Formula Legs, its attacks and movement are actually most similar to if it were using the Gatling Gun, Crescent Bomb K and either High Jump or Plus One Legs.